code.delx.au - pulseaudio/blob - polyp/x11wrap.c

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of polypaudio.
   5
   6   polypaudio is free software; you can redistribute it and/or modify
   7   it under the terms of the GNU Lesser General Public License as published
   8   by the Free Software Foundation; either version 2 of the License,
   9   or (at your option) any later version.
  10
  11   polypaudio is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with polypaudio; if not, write to the Free Software
  18   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  19   USA.
  20 ***/
  21
  22 #include <assert.h>
  23 #include <stdio.h>
  24
  25 #include "llist.h"
  26 #include "x11wrap.h"
  27 #include "xmalloc.h"
  28 #include "log.h"
  29 #include "props.h"
  30
  31 struct pa_x11_client;
  32
  33 struct pa_x11_internal {
  34     PA_LLIST_FIELDS(struct pa_x11_internal);
  35     struct pa_x11_wrapper *wrapper;
  36     struct pa_io_event* io_event;
  37     int fd;
  38 };
  39
  40 struct pa_x11_wrapper {
  41     struct pa_core *core;
  42     int ref;
  43
  44     char *property_name;
  45     Display *display;
  46
  47     struct pa_defer_event* defer_event;
  48     struct pa_io_event* io_event;
  49
  50     PA_LLIST_HEAD(struct pa_x11_client, clients);
  51     PA_LLIST_HEAD(struct pa_x11_internal, internals);
  52 };
  53
  54 struct pa_x11_client {
  55     PA_LLIST_FIELDS(struct pa_x11_client);
  56     struct pa_x11_wrapper *wrapper;
  57     int (*callback)(struct pa_x11_wrapper *w, XEvent *e, void *userdata);
  58     void *userdata;
  59 };
  60
  61 /* Dispatch all pending X11 events */
  62 static void work(struct pa_x11_wrapper *w) {
  63     assert(w && w->ref >= 1);
  64
  65     while (XPending(w->display)) {
  66         struct pa_x11_client *c;
  67         XEvent e;
  68         XNextEvent(w->display, &e);
  69
  70         for (c = w->clients; c; c = c->next) {
  71             assert(c->callback);
  72             if (c->callback(w, &e, c->userdata) != 0)
  73                 break;
  74         }
  75     }
  76 }
  77
  78 /* IO notification event for the X11 display connection */
  79 static void display_io_event(struct pa_mainloop_api *m, struct pa_io_event *e, int fd, enum pa_io_event_flags f, void *userdata) {
  80     struct pa_x11_wrapper *w = userdata;
  81     assert(m && e && fd >= 0 && w && w->ref >= 1);
  82     work(w);
  83 }
  84
  85 /* Deferred notification event. Called once each main loop iteration */
  86 static void defer_event(struct pa_mainloop_api *m, struct pa_defer_event *e, void *userdata) {
  87     struct pa_x11_wrapper *w = userdata;
  88     assert(m && e && w && w->ref >= 1);
  89     work(w);
  90 }
  91
  92 /* IO notification event for X11 internal connections */
  93 static void internal_io_event(struct pa_mainloop_api *m, struct pa_io_event *e, int fd, enum pa_io_event_flags f, void *userdata) {
  94     struct pa_x11_wrapper *w = userdata;
  95     assert(m && e && fd >= 0 && w && w->ref >= 1);
  96
  97     XProcessInternalConnection(w->display, fd);
  98 }
  99
 100 /* Add a new IO source for the specified X11 internal connection */
 101 static struct pa_x11_internal* x11_internal_add(struct pa_x11_wrapper *w, int fd) {
 102     struct pa_x11_internal *i;
 103     assert(i && fd >= 0);
 104
 105     i = pa_xmalloc(sizeof(struct pa_x11_internal));
 106     i->wrapper = w;
 107     i->io_event = w->core->mainloop->io_new(w->core->mainloop, fd, PA_IO_EVENT_INPUT, internal_io_event, w);
 108     i->fd = fd;
 109
 110     PA_LLIST_PREPEND(struct pa_x11_internal, w->internals, i);
 111     return i;
 112 }
 113
 114 /* Remove an IO source for an X11 internal connection */
 115 void x11_internal_remove(struct pa_x11_wrapper *w, struct pa_x11_internal *i) {
 116     assert(i);
 117
 118     PA_LLIST_REMOVE(struct pa_x11_internal, w->internals, i);
 119     w->core->mainloop->io_free(i->io_event);
 120     pa_xfree(i);
 121 }
 122
 123 /* Implementation of XConnectionWatchProc */
 124 static void x11_watch(Display *display, XPointer userdata, int fd, Bool opening, XPointer *watch_data) {
 125     struct pa_x11_wrapper *w = (struct pa_x11_wrapper*) userdata;
 126     assert(display && w && fd >= 0);
 127
 128     if (opening)
 129         *watch_data = (XPointer) x11_internal_add(w, fd);
 130     else
 131         x11_internal_remove(w, (struct pa_x11_internal*) *watch_data);
 132 }
 133
 134 static struct pa_x11_wrapper* x11_wrapper_new(struct pa_core *c, const char *name, const char *t) {
 135     struct pa_x11_wrapper*w;
 136     Display *d;
 137     int r;
 138
 139     if (!(d = XOpenDisplay(name))) {
 140         pa_log(__FILE__": XOpenDisplay() failed\n");
 141         return NULL;
 142     }
 143
 144     w = pa_xmalloc(sizeof(struct pa_x11_wrapper));
 145     w->core = c;
 146     w->ref = 1;
 147     w->property_name = pa_xstrdup(t);
 148     w->display = d;
 149
 150     PA_LLIST_HEAD_INIT(struct pa_x11_client, w->clients);
 151     PA_LLIST_HEAD_INIT(struct pa_x11_internal, w->internals);
 152
 153     w->defer_event = c->mainloop->defer_new(c->mainloop, defer_event, w);
 154     w->io_event = c->mainloop->io_new(c->mainloop, ConnectionNumber(d), PA_IO_EVENT_INPUT, display_io_event, w);
 155
 156     XAddConnectionWatch(d, x11_watch, (XPointer) w);
 157
 158     r = pa_property_set(c, w->property_name, w);
 159     assert(r >= 0);
 160
 161     return w;
 162 }
 163
 164 static void x11_wrapper_free(struct pa_x11_wrapper*w) {
 165     int r;
 166     assert(w);
 167
 168     r = pa_property_remove(w->core, w->property_name);
 169     assert(r >= 0);
 170
 171     assert(!w->clients);
 172
 173     XRemoveConnectionWatch(w->display, x11_watch, (XPointer) w);
 174     XCloseDisplay(w->display);
 175
 176     w->core->mainloop->io_free(w->io_event);
 177     w->core->mainloop->defer_free(w->defer_event);
 178
 179     while (w->internals)
 180         x11_internal_remove(w, w->internals);
 181
 182     pa_xfree(w->property_name);
 183     pa_xfree(w);
 184 }
 185
 186 struct pa_x11_wrapper* pa_x11_wrapper_get(struct pa_core *c, const char *name) {
 187     char t[256];
 188     struct pa_x11_wrapper *w;
 189     assert(c);
 190
 191     snprintf(t, sizeof(t), "x11-wrapper%s%s", name ? "-" : "", name ? name : "");
 192     if ((w = pa_property_get(c, t)))
 193         return pa_x11_wrapper_ref(w);
 194
 195     return x11_wrapper_new(c, name, t);
 196 }
 197
 198 struct pa_x11_wrapper* pa_x11_wrapper_ref(struct pa_x11_wrapper *w) {
 199     assert(w && w->ref >= 1);
 200     w->ref++;
 201     return w;
 202 }
 203
 204 void pa_x11_wrapper_unref(struct pa_x11_wrapper* w) {
 205     assert(w && w->ref >= 1);
 206
 207     if (!(--w->ref))
 208         x11_wrapper_free(w);
 209 }
 210
 211 Display *pa_x11_wrapper_get_display(struct pa_x11_wrapper *w) {
 212     assert(w && w->ref >= 1);
 213     return w->display;
 214 }
 215
 216 struct pa_x11_client* pa_x11_client_new(struct pa_x11_wrapper *w, int (*cb)(struct pa_x11_wrapper *w, XEvent *e, void *userdata), void *userdata) {
 217     struct pa_x11_client *c;
 218     assert(w && w->ref >= 1);
 219
 220     c = pa_xmalloc(sizeof(struct pa_x11_client));
 221     c->wrapper = w;
 222     c->callback = cb;
 223     c->userdata = userdata;
 224
 225     PA_LLIST_PREPEND(struct pa_x11_client, w->clients, c);
 226
 227     return c;
 228 }
 229
 230 void pa_x11_client_free(struct pa_x11_client *c) {
 231     assert(c && c->wrapper && c->wrapper->ref >= 1);
 232
 233     PA_LLIST_REMOVE(struct pa_x11_client, c->wrapper->clients, c);
 234     pa_xfree(c);
 235 }